The aim of this research is to investigate the factors of demotivation in L2 learning of Pakistani undergraduates at the University of Balochistan, Quetta. A mixed-methods research design was employed in this study to explore the factors of demotivation. Quantitative data was obtained from the responses of a population of 116 first semester undergraduates in a questionnaire adopted from Sakai and Kikuchi (2009). The questionnaire comprised 35 close-ended items on a 5-point Likert scale on six factors of demotivation: "grammar-based teaching," "teacher's behaviour," "course contents" and "teaching materials," "effects of low test scores," "classroom environment", and "lack of self-confidence and interest". Qualitative data was obtained from an open-ended question on students' demotivating experiences in learning English in the same questionnaire. Descriptive statistics was used to analyze the quantitative data while the qualitative data was analyzed by using content analysis to extract the themes or factors of demotivation and their categories based on Sakai and Kikuchi's framework. The findings reveal that all six factors were cited by students as demotivational factors with "teaching method," "lack of facilities" and "course content" being the most cited factors, hence supporting Sakai and Kikuchi's (2009) framework. In addition, the qualitative data suggests that a new factor emerged--"negative attitude of society towards English language"--hence a contribution to the body of literature. The findings of the study have implications on the teaching and learning of English in Pakistan.